<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader @addTodo="addTodo"/>
        <MyList :todos="todos"/>
        <MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
      </div>
    </div>
  </div>
</template>

<script>
import MyHeader from "./components/MyHeader";
import MyList from "./components/MyList";
import MyFooter from "./components/MyFooter";

export default {
  name: "App",
  components: { MyHeader, MyList, MyFooter },
  data(){
    return {
      todos:JSON.parse(localStorage.getItem('todos')) || []
    }
  },
  methods:{
    addTodo(todoObj){
      this.todos.unshift(todoObj);
    },
    deleteTodo(id){
      this.todos = this.todos.filter(todo=> todo.id !== id)
    },
    checkAllTodo(done){
      this.todos.forEach(todo => {
        todo.done = done;
      });
    },
    clearAllTodo(){
      this.todos = this.todos.filter(todo=>{
        return !todo.done
      })
    },
    updateTodo(id,title){
      this.todos.forEach(todo => {
        if(todo.id === id){
          todo.title = title;
        }
      });
    }
  },
  watch:{
    todos:
    {
      deep:true,
      handler(value){
        localStorage.setItem('todos',JSON.stringify(value));
      },
    }
  },
  mounted(){
    this.$bus.$on('deleteTodo',this.deleteTodo);
    this.$bus.$on('updateTodo',this.updateTodo);
  },
  beforeDestory(){
    this.$bus.$off('deleteTodo');
    this.$bus.$off('updateTodo');
  }
};
</script>

<style lang="scss">
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-edit {
  color: #fff;
  background-color: #49b1da;
  border: 1px solid #49b1da;
  margin-right: 5px;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
